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ST225 is a pipe compressing tool designed for stopping the flow in polyethylene pipes for gas and water with diameters up to 225 mm (9 “), it has no typical limitations of similar tools that for the compression use common hydraulic jacks” bottle”. ST225 allows a slow reopening of the jaws at the end of the compressing, the tube can be damaged more in the re-opening phase than in the compressing phase because the rapid re-opening, typical of the bottle jacks, causes the so-called “entanglement” phenomenon of the polyethylene fibers, the too rapid reopening does not allow the polymer molecules to return in order in the original position (entanglement) causing rupture breakers in the tube that often result in a break, ST225 avoids this possibility. Thanks to the robustness and its exclusive features ensures the best results and can not be missing in the equipment of modernly equipped teams.